Automatically identifying ip phones through lldp – H3C Technologies H3C S5560 Series Switches User Manual
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Typically, an OUI address refers to the first 24 bits of a MAC address (in binary notation) and is a
globally unique identifier that IEEE assigns to a vendor. However, OUI addresses in this chapter are
addresses that the system uses to determine whether a received packet is a voice packet. They are the
logical AND results of the mac-address and oui-mask arguments in the voice-vlan mac-address
command.
Automatically identifying IP phones through LLDP
When you use OUI addresses to identify IP phones, the number of OUI addresses that can be configured
is limited. Additionally, when there are plenty of IP phones in the network, you must configure many OUI
addresses. If IP phones support LLDP, configure LLDP on the device for automatic IP phone discovery. For
more information, see "Enabling LLDP for automatic IP phone discovery."
Advertising the voice VLAN information to IP
phones
shows the workflow of advertising the voice VLAN information to IP phones.
Figure 51 Workflow of advertising the voice VLAN information to IP phones
After receiving the voice VLAN information, the IP phone automatically completes the voice VLAN
configuration.
•
If the voice VLAN configuration is based on the received LLDP-MED TLVs or CDP packets, the IP
phone will send out packets tagged with the advertised voice VLAN ID. The voice packets will be
forwarded in the voice VLAN.
For more information about configuring LLDP or CDP, see "Configuring LLDP or CDP to advertise
a voice VLAN." For more information about LLDP and CDP compatibility, see "Configuring LLDP."
•
If the voice VLAN configuration is based on the authorization VLAN information, the IP phone will
send out packets tagged with the advertised authorization VLAN ID. The voice packets will be
forwarded in the authorization VLAN.
For more information about advertising the authorization VLAN information to IP phones, see
"Dynamically advertising an authorization VLAN through LLDP or CDP." For more information
about authorization VLANs, see Security Configuration Guide.